Blacklist Checker
Emails suddenly bouncing or landing in spam? Check whether your server’s IP address or your domain appears on the major DNS blacklists used by mail providers.
How it works
- 1
Enter an IP or domain
Use your mail server’s IPv4 address or your sending domain.
- 2
We query the lists live
IP and domain blacklists are checked in parallel over DNS.
- 3
Review each result
See where you are listed so you can request removal.
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Frequently asked questions
Both, if you can. IP lists track the server that sends your email, while domain lists track links and addresses inside the messages.
What an email blacklist is and why it matters
DNS blacklists (DNSBLs) are public lists of IP addresses and domains caught sending spam, spreading malware or running open relays. Mail servers query them for every incoming message, and a listing can make Gmail, Outlook and corporate filters reject or quarantine your email.
Listings usually follow a compromised account, an infected computer on the network, a purchased mailing list or a sudden spike in volume. The fix is to stop the cause first, then follow the delisting procedure published by each list; most remove clean addresses automatically after a few days.
Some lists refuse queries coming from large public DNS resolvers, so a result may show “no answer”. That is not a listing. Run the check again later, or from your own server, for a definitive result.